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Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
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Influence of Ural and European blocking on Arctic sea ice loss.
SS5-01-S
Binhe Luo* , College of Oceanic and Atmospheric Sciences, Ocean University of China
Lixin Wu, Physical Oceanography Laboratory, Ocean University of China
Dehai Luo, Institute of Atmospheric Physics, Chinese Academy of Sciences
Presenter Email: luobh@tea.ac.cn
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| The relationship between mid-high latitude blocking in the northern hemisphere and the decline in Arctic winter sea ice investigated using ERA daily 500hPa geopotential height reanalysis data. Results show that there are high blocking frequencies over Ural rather than Eurasia, which correlate closely with the area of reduced Arctic winter sea ice in the past 30 years as observed from satellite data. Differences in surface temperature, Sensible and latent heat flux meridional heat transport and temperature advection in 850 hPa anomaly fields between days with and without blocking were calculated and the results show that mid-high latitude blocking has a significant impact on the reduction in sea ice. An increase in Ural blocking frequency in northern hemisphere mid-high latitudes will increase the surface air temperature, poleward heat transport, and temperature advection, Sensible and latent heat flux, further accelerate the melting of Arctic sea ice. Therefore, thermodynamic effects caused by blocking over the Ural and could result in a marked reduction in Arctic sea ice rather than Eurasian. |
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